Chris Jones - Bug 572134: "Undefer" the in-call that lost a race at stack-depth 1, if there is one, when RPCChannel code leaves the C++ stack, so that the in-call can be processed if there is an immediately following out-call. r=bsmedberg

Benjamin Smedberg - Bug 561871 part B: don't use Windows events to enter/exit a nested event loop within an RPC stack frame, because delivery of those events isn't always associated with the correct stack frame, and also because the events can be lost if they race with an incoming RPC reply message. Instead, keep a linked list (on the stack) of RPC frames globally and per-channel, to associate requests to enter a nested event loop with the correct frame, r=jimm

Chris Jones - Bug 540886, part 2: Offer a BlockChild() interface to RPC protocols that allows parents to prevent children from sending messages back of their own volition until the parent calls UnblockChild(). r=bent

Chris Jones - bug 517923: support serializing ns*Strings that represent NULL, use this mechanism in PluginInstanceParent/PluginModuleChild. also add basic crash-handling to *Channel code and some NS_OVERRIDE annotations.